Multivariate correction of chemical interferences in hydride generation atomic absorption spectrometry

✍ Scribed by Günter Henrion; René Henrion; Ralph Hebisch; Birgit Boeden

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 692 KB
• Volume: 268
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85254-4

✦ Synopsis

In hydnde generation ammlc absorptKm spectrnuletry, chemcal Ilelfer~S among llydrlde-forrmng elemeats lead to systematic errors m the determmatlon of concentrations Using the system of Se, Sb and As as an example of snnultaneously occurring elements, it IS shown how to remove the systematic underestlmatlons by the use of multwomponent cahbratlon The advantage of this approach rehes on the multwanate treatment of mutual interferences For the gwen problem, apphcatlon of multiple linear regression turns out to be equivalent to partial least squares Estunatlon of the standard error of prediction confirms the temporal stability of the model Further, m contrast to the predlctlon of concentrations, an "mverse" model IS estabhshed m order to attempt a descnptlon of interferences Keywor& Atonuc absorption spectrometxy, Antimony, Arsenic, Hydnde generation, Multwanate analysis, Selenium The determination of hydride-formmg elements plays an nnportant role m analytical chemlstry The mam reason IS their hrgh ecotoxlclty at very low concentration levels The method of choice for the determination of elements such as As, Sb and Se (which are subject of thrs paper) IS hydride generation atomic absorption spectrometry (HGAAS) Hydride generation may be reallzed m batch and m contmuous-flow modes The mam advantage of the hydride generation technique IS good preconcentratlon, chermcal separation of the analyte from potential matIvr mterferences and very effxaent mtroductlon of the analyte mto the atomizer [l] On the other hand, many interferences exist A first systematx report on mtererences of 48 elements was given by Smrth [2] He found that the most serious interferences